Stroke is the fourth leading cause of death after heart disease and cancer and a leading cause of serious, long-term disability, according to the American Heart Association (AHA) and the American Stroke Association (ASA). The ASA reports that strokes kill about 137,000 people a year, accounting for about one of every 18 deaths. Find out more about stroke by taking this quiz, based on information from the AHA and the National Institute of Neurological Disorders and Stroke (NINDS).